<s>
ARINC	B-Device
424	I-Device
or	O
ARINC	B-Device
424	I-Device
Navigation	O
System	O
Data	O
Base	O
Standard	O
is	O
an	O
international	O
standard	O
file	O
format	O
for	O
aircraft	O
navigation	O
data	O
maintained	O
by	O
Airlines	O
Electronic	O
Engineering	O
Committee	O
and	O
published	O
by	O
Aeronautical	O
Radio	O
,	O
Inc	O
.	O
</s>
<s>
The	O
ARINC	B-Device
424	I-Device
specifications	O
are	O
not	O
a	O
database	O
,	O
but	O
a	O
"	O
standard	O
for	O
the	O
preparation	O
and	O
transmission	O
of	O
data	O
for	O
assembly	O
of	O
airborne	O
navigation	O
system	O
data	O
bases	O
"	O
.	O
</s>
<s>
ARINC	B-Device
424	I-Device
specifies	O
a	O
132-byte	O
fixed-length	O
record	O
format	O
.	O
</s>
<s>
Since	O
its	O
initial	O
publication	O
in	O
May	O
1975	O
ARINC	B-Device
424	I-Device
has	O
been	O
amended	O
many	O
times	O
,	O
introducing	O
new	O
record	O
types	O
and	O
field	O
values	O
and	O
revised	O
coding	O
rules	O
as	O
required	O
by	O
new	O
technologies	O
and	O
classes	O
of	O
equipment	O
such	O
as	O
GPS	O
and	O
Flight	O
Management	O
Computers	O
.	O
</s>
